, Volume 26, Issue 7, pp 2065-2071
Date: 12 Jul 2012

Heating performance characteristics of stack coolant source heat pump using R744 for fuel cell electric vehicles

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Abstract

The objective of this study is to investigate the performance characteristics of a stack coolant source heat pump using R744 with a stack coolant heat source for fuel cell electric vehicles under cold weather conditions. Electric heaters are currently used in fuel cell electric vehicles, and the high levels of energy consumption involved lead to lower fuel efficiency and a reduction in the vehicle’s driving range. In order to improve the efficiency of the fuel cell electric vehicles in this study, a heat pump using R744 as a refrigerant and making use of wasted heat from the stacks is developed to cover the heating capacity. This heat pump is tested and performance optimized for stack coolant heat recovery under the compressor speeds, air temperatures, and flow rates of the interior heat exchanger, as well as the coolant flow rates of the CO2-coolant heat exchanger. In addition, the heating capacity of the tested system was sufficiently attained over 5.0 kW at the coolant flow rate of 5.0 l/min under extremely cold weather conditions of −20°C.

This paper was presented at the ICMR2011, Busan, Korea, November 2011.
Recommended by Guest Editor Dong-Ho Bae
Hoseong Lee received his Master’s degree in 2006 from Korea University, Korea. He then worked as a researcher at Hyundai Motors until August 2007. Since then, he has been working in Thermal management system research center, KATECH, Korea.
Mooyeon Lee received his Ph.D degree in 2010 from Korea University, Korea. He then worked as a research professor at Department of Mechanical Engineering, Korea University, Korea, until March January 2011. Currently, he is working in Thermal management system research center, KATECH, Korea.